Granted Patent
Utility
US 5,124,047 · App. 07/607,977
Method of inhibiting scale deposits
Inventors:
Loc Quach, Lai-Duien Grace Fan
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: Nov 1, 1990
Inventors
Loc Quach
Lai-Duien Grace Fan
Assignee (at issue)
W.R. Grace & Co. Conn.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.